Tonekabon County (Persian: شهرستان تنکابن) is in Mazandaran province, Iran. Its capital is the city of Tonekabon.

In 2009 National Census, Abbasabad District was separated from the county in the establishment of Abbasabad County. Additionally, the city of Shirud was formed upon the merger of 19 villages.

In 2019, Baladeh-ye Sharqi Rural District was created in Khorramabad District, and Do Hezar and Seh Hezar Rural Districts were separated from it in the formation of Kuhestan District, which was divided into three rural districts, including the new Miyandaman Rural District.

At the time of the 2006 census, the county's population was 193,428 in 55,318 households. The following census in 2011 counted 153,940 people in 48,845 households. The 2016 census measured the population of the county as 166,132 in 56,636 households.

Tonekabon County's population history and administrative structure over three consecutive censuses are shown in the following table.

Media related to Tonekabon County at Wikimedia Commons